Synthesis of mesoporous γ-AlOOH@Fe3O4 magnetic nanomicrospheres

► Mesoporous γ-AlOOH@Fe3O4 magnetic nanomicrospheres were synthesized consisting of a mesoporous γ-AlOOH shell and a Fe3O4 magnetic core. ► Diameter of γ-AlOOH@Fe3O4 was about 200 nm, the thickness of γ-AlOOH shell was about 5 nm with average pore size of 3.8 nm. ► Thickness of mesoporous γ-AlOOH can be controlled via layer-by-layer coating.